The Brisbane Broncos have signed hulking Melbourne prop Mitch Garbutt for the 2015 and 2016 NRL seasons.

The 25-year-old Newcastle junior debuted for the Storm in round 14 last year and has played nine games for the club.

He has spent the majority of this season with Easts in the Queensland Cup, where he has impressed with his hard running.

"Mitch will add some depth and some size to our squad next season," Broncos coach Anthony Griffin said in a club statement.

"He is coming to the right age as a front rower and has the best football of his career in front of him.

"I'm sure he will fit in well at the Broncos and his addition will complement the other talent we have in our group of forwards."

With questions over the form and future of marquee signing Martin Kennedy and veteran Ben Hannant's relationship with Griffin seemingly on the rocks; the 115-kilogram, 190-centimetre Garbutt should add some much-needed muscle up front next season alongside Josh McGuire.

"The Broncos are a really professional club and I'll do the hard work necessary to get into the side," he said.

"There are some great players at the club so I can learn a lot there."